A lot of good points raised here.
When I hunt public land they are the biggest chunks of property around, as a result it is common for vehicles of all descriptions to be in the parking areas all day. There are more non-turkey hunters out in the spring here in WI than there are turkey hunters; mushroom hunters, hikers, bird watchers, flower admirers, trout fishermen etc. So just because a vehicle is in the lot, including early in the morning, does not mean another hunter is about. This is why I question simply leaving just because someone else parked there first.
Once in a while I hear a turkey hunter complain about these other users and some even want to ban them from using WMAs during hunting seasons because as they walk in on the trails they mess up the setup. None of this should be a problem unless the hunter sets up on the trail; so don't setup on a trail unless you are understanding of interference.
Then anyone can walk a trail without worrying about messing up another hunter. Occasionally, I've had situations while setup well off any trail with a hot gobbler (who you actually wish would shut up a little as to not attract unwanted attention) lures in another hunter. In these cases I speak to alert the other guy, after they get over the startle they always feel bad and leave. I wait quietly for a time and go back to working the bird. Sometimes I meet them later and we exchange stories as we become friends. What's not to like? Especially, if the gobbler is in my vest.
On average turkey hunters are the most well mannered polite hunters you could hope to meet, which is why I like meeting them
If you agree with me call it fact; if you disagree - call it my opinion.
After all - we are talking turkey.